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Hey all I am wanting another set of eyes to review my schematic to make sure I have everything connected correctly. It looks like its connected correctly to me but another set of eyes on it is always a good thing!
I'm also wanting to find better substitutes for the C1 470uf and C2 1uf caps. Are there any that I can get that are smaller (height wise)? I'm looking to have the smallest height possible.
Note that I did my own thing for the power conversion and the RGB.
Here is what I used to go by while creating the schematic:
I'm also wanting to find better substitutes for the C1 470uf and C2 1uf caps. Are there any that I can get that are smaller (height wise)? I'm looking to have the smallest height possible.
Note that I did my own thing for the power conversion and the RGB.
Here is what I used to go by while creating the schematic:
Rich (BB code):
1. Bidirectional Level Shifter (3.3V ↔ 5V) - VERIFIED BIDIRECTIONAL LEVEL SHIFTER
Valentine One Side (5V) ESP32-C3 Side (3.3V)
───────────────────────── ─────────────────────────
+5V +3.3V
│ │
╔══╗ ╔══╗
║R1║ 10kΩ ║R3║ 10kΩ
╚══╝ ╚══╝
│ │
├─────────── To V1 DATA ├─────────── To GPIO21/TX
│ (RJ11 Pin 2) │ To GPIO20/RX
│ │
Drain Drain
│ │
┌───┴───┐ ┌───┴───┐
│ │ │ │
│ Q1 │ │ Q2 │
│BSS138 │ │BSS138 │
│ │ │ │
└───┬───┘ └───┬───┘
Gate Gate
│ │
└─────────────────┬─────────────────────────┘
│
│ +3.3V
│ │
│ ╔══╗
│ ║R2║ 10kΩ
│ ╚══╝
│ │
└──┤ (Gates connected together)
│
Source│Source
│ │
┴ ┴
GND GND
IMPORTANT: Both MOSFET Sources MUST connect to GND
Step-by-Step Connection Guide for Level Shifter:
Install Q1 (BSS138 or 2N7000):
================================
Source (Pin 1) → Connect to GND
Gate (Pin 2) → Leave for now (will connect in step 5)
Drain (Pin 3) → Connect to V1 DATA line
Install Q2 (BSS138 or 2N7000):
================================
Source (Pin 1) → Connect to GND
Gate (Pin 2) → Leave for now (will connect in step 5)
Drain (Pin 3) → Connect to ESP32 GPIO21 and GPIO20
Install R1 (10kΩ pull-up):
================================
One end → +5V supply
Other end → Q1 Drain (same point as V1 DATA)
Install R3 (10kΩ pull-up):
================================
One end → +3.3V supply
Other end → Q2 Drain (same point as GPIO20/21)
Connect Gates Together with R2:
================================
Connect Q1 Gate to Q2 Gate with a wire
Install R2 (10kΩ): One end to +3.3V, other end to the connected gates
Verify Connections:
================================
Both Sources are at GND
Gates are connected together and pulled to 3.3V
Each Drain has its respective pull-up
2. Legacy Mode 1.4V Pull-up Generator - VERIFIED LEGACY MODE 1.4V GENERATOR
Control Stage Voltage Generation Stage
────────────── ─────────────────────────
GPIO6 ──┐
│
╔══╗
║R5║ 1kΩ +3.3V +3.3V
╚══╝ │ │
│ ╔══╗ ╔══╗
Gate ║R6║ ║R7║
│ ║10kΩ ║10kΩ
┌───┴───┐ ╚══╝ ╚══╝
│ │ │ │
│ Q3 │Drain └────┬────────┘
│BSS138 ├──────────────────────Base
│ │ │
└───┬───┘ ┌───┴───┐
Source │ │Collector
│ │ Q5 ├────────── To V1 DATA
┴ │MMBT │ (1.4V output)
GND │2222A │
│ │
└───┬───┘
Emitter
│
╔══╗
║R8║ 4.7kΩ
╚══╝
│
┴
GND
Step-by-Step Connection Guide for Legacy Pull-up:
================================
Install Q3 (BSS138 Control MOSFET):
Source → GND
Gate → Through R5 (1kΩ) to GPIO6
Drain → Will connect to Q5 base circuit
Install Voltage Divider (R6 and R7):
================================
R6 (10kΩ): One end to +3.3V
R7 (10kΩ): One end to +3.3V
Connect other ends of R6 and R7 together (creates ~2.1V when active)
Install Q5 (MMBT2222A or 2N2222):
================================
Base → Connect to junction of R6/R7 AND Q3 Drain
Emitter → Through R8 (4.7kΩ) to GND
Collector → Connect to V1 DATA line
Install R5 (1kΩ gate resistor):
================================
One end → GPIO6
Other end → Q3 Gate
Install R8 (4.7kΩ emitter resistor):
================================
One end → Q5 Emitter
Other end → GND
Operation Verification:
================================
GPIO6 LOW: No pull-up on DATA line
GPIO6 HIGH: ~1.4V appears on DATA line
3. MUTE Control Circuit - VERIFIED MUTE CONTROL CIRCUIT
Control Input Output Stage
────────────── ──────────────
V1 MUTE Pin 5
│
╔═══╗
║R10║ 10kΩ (Internal V1 pull-up)
╚═══╝
│
GPIO5 ──┐ ├────── To V1 Pin 5 (MUTE)
│ │
╔══╗ Drain
║R9║ 10kΩ │
╚══╝ ┌───┴───┐
│ │ │
Gate │ Q4 │
│ │BSS138 │
┌───┴───┐ │ │
│ NC │ └───┬───┘
│ │ Source
└───────┘ │
(R9 protects gate) ┴
GND
Note: V1 has internal pull-up, R10 shown for reference
Step-by-Step Connection Guide for MUTE Control:
Install Q4 (BSS138 MUTE Control):
================================
Source → GND
Gate → Through R9 to GPIO5
Drain → Direct to V1 MUTE (Pin 5 of RJ11)
Install R9 (10kΩ protection resistor):
================================
One end → GPIO5
Other end → Q4 Gate
Note about R10:
================================
R10 is INTERNAL to V1, do NOT add external pull-up
V1 maintains MUTE line at +5V when idle
Operation:
================================
GPIO5 LOW: MUTE line stays at +5V (no mute)
GPIO5 HIGH: Q4 pulls MUTE to GND (activates mute)
4. Power and Ground Connections - VERIFIED POWER DISTRIBUTION
From Valentine One ESP32-C3 Power
────────────────── ────────────────
RJ11 Pin 4 (+12V) ──┐ USB 5V ──┐
│ │
[UNUSED] [Internal LDO]
│ │
│ +3.3V
RJ11 Pin 3 (GND) ───┬───────────────────────┤
│ │
┴ ┴
COMMON GND COMMON GND
CRITICAL: V1 GND and ESP32 GND MUST be connected together
Step-by-Step Connection Guide for Power:
Connect Grounds:
================================
V1 Pin 3 (GND) → ESP32 GND
This is CRITICAL for proper operation
V1 Power (Pin 4):
================================
NOT USED for powering ESP32
Leave disconnected or add protection diode only
ESP32 Power:
================================
Power via USB (5V)
ESP32 generates its own 3.3V
Add Bypass Capacitors:
================================
100nF ceramic near ESP32 3.3V pin
10µF electrolytic on 3.3V rail
5. Complete Pin Connection Summary RJ11 CONNECTOR (Looking into jack)
┌──────────────────────────┐
│ 6 5 4 3 2 1 │
└──────────────────────────┘
NC MUTE +12V GND DATA NC
CONNECTIONS:
Pin 1: Not Connected
Pin 2: DATA → Level Shifter Q1 Drain AND Legacy Gen Q5 Collector
Pin 3: GND → Common Ground for entire circuit
Pin 4: +12V → Not used (ESP powered via USB)
Pin 5: MUTE → Q4 Drain (MUTE control)
Pin 6: Not Connected
ESP32-C3 CONNECTIONS:
GPIO20: RX → Level Shifter Q2 Drain
GPIO21: TX → Level Shifter Q2 Drain (same connection)
GPIO5: → R9 → Q4 Gate (MUTE control)
GPIO6: → R5 → Q3 Gate (Legacy control)
GPIO8: → R11 (220Ω) → LED → GND
GND: → Common ground
3.3V: → Pull-ups and bias resistors
Critical Design Verification Points
✅ Level Shifter Checklist:
================================
Both MOSFET sources connected to GND
Gates connected together with 3.3V pull-up
5V pull-up on V1 side drain
3.3V pull-up on ESP32 side drain
No direct 5V to 3.3V connection
✅ Legacy Generator Checklist:
================================
Q5 collector to DATA line (provides 1.4V)
Q5 emitter through 4.7kΩ to GND
Voltage divider creates ~2.1V at base
Q3 controls activation
✅ MUTE Control Checklist:
================================
Q4 drain to MUTE pin
Q4 source to GND
NO external pull-up (V1 has internal)
Gate protection resistor installed
✅ Power Checklist:
================================
Common ground between V1 and ESP32
ESP32 powered via USB only
12V from V1 NOT connected to ESP32
Bypass capacitors installed
